How does PageSourceSearch know what pyrefly.org is built with?

From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.

How far back does the history of pyrefly.org go?

To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.

Can I see an older version of a script from pyrefly.org?

Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.

Which other websites use the same tracking IDs as pyrefly.org?

Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Site profile

pyrefly.org

Built with gtag, mermaid 12.0.0, @marimo-team/frontend 0.25.0, swagger-ui-dist 5.33.0, @inkeep/cxkit-js 0.5.119, @reachfive/identity-ui 2.1.0, typesense-instantsearch-adapter 3.0.2, @cognigy/webchat 3.50.0, @ruffle-rs/ruffle 0.6.0, paymob-pixel 1.2.7, clipboard.js 2.0.0, vditor 4.0.0 and more. 4 pages and 214 stored files, last crawled 2026-10-02.

rank 1,272,091 37 libraries 1 identifier 84 third-party hosts 1 crawl open the site

Technologies and libraries

Recognised by fingerprinting the stored files and bundles against known releases; a version is the release the bytes match.

Library	Version	Seen
gtag		2026-10-02
mermaid	12.0.0	2026-10-02
@marimo-team/frontend	0.25.0	2026-10-02
swagger-ui-dist	5.33.0	2026-10-02
@inkeep/cxkit-js	0.5.119	2026-10-02
@reachfive/identity-ui	2.1.0	2026-10-02
typesense-instantsearch-adapter	3.0.2	2026-10-02
@cognigy/webchat	3.50.0	2026-10-02
@ruffle-rs/ruffle	0.6.0	2026-10-02
paymob-pixel	1.2.7	2026-10-02
clipboard.js	2.0.0	2026-10-02
vditor	4.0.0	2026-10-02
diff2html	3.4.56	2026-10-02
volantis-static	0.0.1761982841160	2026-10-02
ant-design-vue	4.2.6	2026-10-02
cytoscape	3.34.3	2026-10-02
@vitest/utils	5.0.2	2026-10-02
@covalent/components	11.22.1	2026-10-02
docs-searchbar.js	2.5.0	2026-10-02
dayjs-with-plugins	1.0.4	2026-10-02
@ckeditor/ckeditor5-build-classic	44.3.0	2026-10-02
latex.js	0.12.6	2026-10-02
@live-codes/monaco-editor	0.3.1	2026-10-02
@apollographql/graphql-playground-react	1.7.42	2026-10-02
@prefecthq/prefab-ui	0.20.2	2026-10-02
@inkeep/agents-ui-js-cloud	0.17.8	2026-10-02
@antv/g2plot	2.4.35	2026-10-02
vanilla-jsoneditor	3.13.0	2026-10-02
@wix/image	1.454.0	2026-10-02
@pydantic/ai-chat-ui	2.3.0	2026-10-02
@mermaid-js/parser	2.0.0	2026-10-02
@solace-health/solace-entry-widget	2.0.5	2026-10-02
@mermaid-js/layout-elk	1.0.0	2026-09-25
@formio/js	5.6.1	2026-09-25
@observablehq/katex	0.11.1	2026-09-25
@gradio/lite	5.45.0	2026-09-25
@pyscript/core	0.7.31	2026-09-25

Tracking, tag and verification IDs

Public identifiers read out of the source. Each links to every other site in the index that carries the same one.

What	Value	Found in
Google Analytics 4 measurement id (Google)	G-GSX14JC495	view source

Third-party hosts

Hosts outside pyrefly.org that its pages load scripts, frames or stylesheets from, and that its own scripts name in absolute URLs (connect). Each links to every site loading from the same host.

Host	Loaded as	Found in
astral.sh	connect	view source
asukaminato.eu.org	connect	view source
bazel.build	connect	view source
blog.jetbrains.com	connect	view source
bsky.app	connect	view source
buck2.build	connect	view source
buttons.github.io	script connect	view source
cdnjs.cloudflare.com	script connect	view source
code.visualstudio.com	connect	view source
devblogs.microsoft.com	connect	view source
discord.com	connect	view source
discord.gg	connect	view source
discuss.python.org	connect	view source
docs.astral.sh	connect	view source
docs.marimo.io	connect	view source
docs.pydantic.dev	connect	view source
docs.python.org	connect	view source
docusaurus.io	connect	view source
drive.google.com	connect	view source
en.wikipedia.org	connect	view source
engineering.fb.com	connect	view source
factoryboy.readthedocs.io	connect	view source
flow.org	connect	view source
git-scm.com	connect	view source
github.blog	connect	view source
github.com	connect	view source
googleads.g.doubleclick.net	connect	view source
hacklang.org	connect	view source
htmlpreview.github.io	connect	view source
i.ytimg.com	connect	view source
instagram-engineering.com	connect	view source
jupyter.org	connect	view source
jupyterlab-lsp.readthedocs.io	connect	view source
lean-lang.org	connect	view source
lsp.sublimetext.io	connect	view source
marimo.io	connect	view source
marketplace.visualstudio.com	connect	view source
mastodon.social	connect	view source
microsoft.github.io	connect	view source
mypy.readthedocs.io	connect	view source
neovim.io	connect	view source
numpy.org	connect	view source
open-vsx.org	connect	view source
opensource.facebook.com	connect	view source
opensource.fb.com	connect	view source
people.inf.ethz.ch	connect	view source
peps.python.org	connect	view source
positron.posit.co	connect	view source
pydantic.dev	connect	view source
pypi.org	connect	view source
pypistats.org	connect	view source
pyre-check.org	connect	view source
python-type-checking.com	connect	view source
pytorch.org	connect	view source
quarto.org	connect	view source
reactjs.org	connect	view source
registry.bazel.build	connect	view source
rustup.rs	connect	view source
rustwasm.github.io	connect	view source
schema.org	connect	view source
semver.org	connect	view source
static.doubleclick.net	connect	view source
staticdocs.thefacebook.com	connect	view source
toml.io	connect	view source
typing.python.org	connect	view source
typing.readthedocs.io	connect	view source
us.pycon.org	connect	view source
www.attrs.org	connect	view source
www.djangoproject.com	connect	view source
www.facebook.com	connect	view source
www.google.com	connect	view source
www.googletagmanager.com	script	view source
www.internalfb.com	connect	view source
www.jetbrains.com	connect	view source
www.kylei.dev	connect	view source
www.linkedin.com	connect	view source
www.pantsbuild.org	connect	view source
www.python.org	connect	view source
www.threads.net	connect	view source
www.w3.org	connect	view source
www.youtube-nocookie.com	connect	view source
www.youtube.com	iframe connect	view source
youtu.be	connect	view source
zed.dev	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 214) }. Versions are the crawls at which the file was new or its content changed; each opens the file as it was then, rebuilt from the same stored chunks.

File	Kind	Size	Collected	Versions
https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.0/clipboard.min.js	js library	not fetched	2026-10-02	current
https://pyrefly.org/assets/js/5130.d9b16cc7.js	js	2.4 KB	2026-10-02	current
https://www.googletagmanager.com/gtag/js?id=G-GSX14JC495	js library	not fetched	2026-10-02	current
https://pyrefly.org/assets/js/5047.861c98ea.js	js	720 B	2026-10-02	current
https://pyrefly.org/assets/js/5005.cc1d776f.js	js	4.2 KB	2026-10-02	current
https://pyrefly.org/assets/js/4958.efe02784.js	js	4.5 KB	2026-10-02	current
https://pyrefly.org/assets/js/4962.853c8e97.js	js library	1.8 KB	2026-10-02	current
https://pyrefly.org/assets/js/4913.b7bde8a7.js	js	12.6 KB	2026-10-02	current
https://pyrefly.org/assets/js/4906.cb0671c5.js	js	3.5 KB	2026-10-02	current
https://pyrefly.org/assets/js/4839.e35d862d.js	js	37.3 KB	2026-10-02	current
https://pyrefly.org/assets/js/4903.cea0a957.js	js	408 B	2026-10-02	current
https://pyrefly.org/assets/js/4810.e4ff2a0a.js	js	81.9 KB	2026-10-02	current
https://pyrefly.org/assets/js/4791.5360931f.js	js	51 KB	2026-10-02	current
https://pyrefly.org/assets/js/4773.72e3756a.js	js	20.2 KB	2026-10-02	current
https://pyrefly.org/assets/js/4750.0d2aa4bf.js	js	2 KB	2026-10-02	current
https://pyrefly.org/assets/js/4738.eb0b829d.js	js	11.7 KB	2026-10-02	current
https://pyrefly.org/assets/js/4735.a713875d.js	js	188 B	2026-10-02	current
https://pyrefly.org/assets/js/4706.166fffd4.js	js	26.2 KB	2026-10-02	current
https://pyrefly.org/assets/js/4702.84ced0d0.js	js	15 KB	2026-10-02	2026-10-02
https://pyrefly.org/assets/js/4698.8e03a434.js	js library	3.3 KB	2026-10-02	current
https://pyrefly.org/assets/js/4680.bcdd6ba1.js	js library	4.1 KB	2026-10-02	current
https://pyrefly.org/assets/js/4662.34362718.js	js	252 B	2026-10-02	current
https://pyrefly.org/assets/js/4638.9d5f7b2f.js	js	8.6 KB	2026-10-02	current
https://pyrefly.org/assets/js/4630.b8dde9c5.js	js library	4.9 KB	2026-10-02	current
https://pyrefly.org/assets/js/4627.604a353a.js	js	13.2 KB	2026-10-02	current
https://pyrefly.org/assets/js/4607.cc4ca9f9.js	js	16.5 KB	2026-10-02	2026-10-02
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https://pyrefly.org/assets/js/4482.665b8f15.js	js	468 B	2026-10-02	current
https://pyrefly.org/assets/js/4444.1fd662d0.js	js	114.5 KB	2026-10-02	current
https://pyrefly.org/assets/js/4450.7fa292d5.js	js	14.7 KB	2026-10-02	current
https://pyrefly.org/assets/js/4376.3e31115f.js	js	662.2 KB	2026-10-02	current
https://pyrefly.org/assets/js/4405.5019403b.js	js	418 B	2026-10-02	current
https://pyrefly.org/assets/js/4334.99603dd9.js	js library	2.2 KB	2026-10-02	current
https://pyrefly.org/assets/js/4283.e1b69f5e.js	js	399 B	2026-10-02	current
https://pyrefly.org/assets/js/4152.17a03f64.js	js	29.9 KB	2026-10-02	current
https://pyrefly.org/assets/js/4142.78c4a5d0.js	js	183 B	2026-10-02	current
https://pyrefly.org/assets/js/4120.20af9889.js	js library	2.8 KB	2026-10-02	current
https://pyrefly.org/assets/js/4104.a197bc1a.js	js	29.9 KB	2026-10-02	2026-10-02
https://pyrefly.org/assets/js/4114.ed35c5e4.js	js library	2.1 KB	2026-10-02	current
https://pyrefly.org/assets/js/4101.d6a6d24f.js	js	7.8 KB	2026-10-02	current
https://pyrefly.org/assets/js/4056.6fe627ab.js	js	3 KB	2026-10-02	current
https://pyrefly.org/assets/js/3945.eddf451d.js	js	17.4 KB	2026-10-02	current
https://pyrefly.org/assets/js/3985.24c25eda.js	js	4 KB	2026-10-02	current
https://pyrefly.org/assets/js/3860.008b8636.js	js	282 B	2026-10-02	current
https://pyrefly.org/assets/js/3906.6c21daf8.js	js	15.9 KB	2026-10-02	current
https://pyrefly.org/assets/js/3726.1245cca9.js	js library	1.8 KB	2026-10-02	current
https://pyrefly.org/assets/js/3632.37572140.js	js	66.1 KB	2026-10-02	current
https://pyrefly.org/assets/js/3622.6b856240.js	js	907 B	2026-10-02	current
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https://pyrefly.org/assets/js/3524.775fc37b.js	js	7.6 KB	2026-10-02	current
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https://pyrefly.org/assets/js/3096.9dbf43d2.js	js	3.9 KB	2026-10-02	current
https://pyrefly.org/assets/js/3094.e315b367.js	js	3.2 KB	2026-10-02	current
https://pyrefly.org/assets/js/3062.e5818cff.js	js library	4.2 KB	2026-10-02	current
https://pyrefly.org/assets/js/3042.ba040fb9.js	js	409 B	2026-10-02	current
https://pyrefly.org/assets/js/3028.914bbbbc.js	js	157.3 KB	2026-10-02	2026-10-02
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https://pyrefly.org/assets/js/3014.c142364d.js	js	10.9 KB	2026-10-02	current
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https://pyrefly.org/assets/js/2398.d088f86e.js	js library	7.5 KB	2026-10-02	current
https://pyrefly.org/assets/js/2355.fb558916.js	js	188 B	2026-10-02	current
https://pyrefly.org/assets/js/2309.7a479f9e.js	js	536 B	2026-10-02	current
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https://pyrefly.org/assets/js/2244.f7e117db.js	js library	3 KB	2026-10-02	current
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Timeline

One entry per crawl, newest first, with what changed since the crawl before: libraries, identifiers, third-party hosts and files. Historical versions stay viewable because the stored chunks are shared between versions, never copied.

2026-10-02 first crawl

4 pages, 202 files, 4.9 MB; 32 libraries, 1 identifier, 84 third-party hosts
32 libraries added
- gtag
- @vitest/utils 5.0.2
- @wix/image 1.454.0
- docs-searchbar.js 2.5.0
- diff2html 3.4.56
- paymob-pixel 1.2.7
- swagger-ui-dist 5.33.0
- @reachfive/identity-ui 2.1.0
- @cognigy/webchat 3.50.0
- @inkeep/cxkit-js 0.5.119
- @inkeep/agents-ui-js-cloud 0.17.8
- typesense-instantsearch-adapter 3.0.2
- and 20 more
1 identifier added
- G-GSX14JC495 Google Analytics 4 measurement id
87 third-party hosts added
- www.googletagmanager.com
- buttons.github.io
- cdnjs.cloudflare.com
- www.youtube.com
- www.w3.org
- docusaurus.io
- github.com
- www.internalfb.com
- staticdocs.thefacebook.com
- reactjs.org
- discord.gg
- bsky.app
- and 75 more
202 files added

Questions about pyrefly.org

How does PageSourceSearch know what pyrefly.org is built with?: From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.
How far back does the history of pyrefly.org go?: To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.
Can I see an older version of a script from pyrefly.org?: Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.
Which other websites use the same tracking IDs as pyrefly.org?: Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Look up another site, browse sites by tracking ID, third-party host or technology. Site owners: see the crawler page for how stored pages are removed.